CN102968380A - Method and device for managing memory partitions of memory filesystem - Google Patents
Method and device for managing memory partitions of memory filesystem Download PDFInfo
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Abstract
The embodiment of the invention discloses a method for managing the memory partitions of a memory filesystem. The method comprises that a write request for writing the size file data into a first memory partition is received; when the size Y of a free space of the first memory partition is judged to be smaller than the size X of the file data, a request is submitted to the system for a second memory partition; all the file data which is written into the first memory partition is copied into the second memory partition, and the space of the first memory partition is released; and when the second memory partition is found out to have an enough free memory block, the X-bit file data is written into the free memory block. After the method is adopted, the memory partitions can be dynamically managed, memory fragments cannot be generated, and the utilization rate of a memory space is increased.
Description
Technical field
The present invention relates to the management method of memory partitioning in the memory file system, relate in particular to the dynamically method and apparatus of increase and decrease of a kind of internal memory.
Background technology
Memory file system is a kind of file system that is based upon on the internal memory, the temporary file when being mainly used to the storage system operation.For the file system on being based upon disk (data are stored on the disk), catalogue, fileinfo and data all in the memory file system all are stored in the internal memory, and it is fast to have the speed of reading and writing data, the characteristics such as the rear loss of data of outage have two kinds of memory file system: Ramdisk and Ramfs at present.
Ramdisk just uses as subregion to internal memory of system's application when initialization, and this memory partitioning size is fixing, can not change afterwards, and before the file system unloading, the internal memory of distribution takies always.During the inner every less important use internal memory of Ramdisk, all be to look for one to specify the free space of size to use at this memory partitioning of having applied for.The Ramdisk technology can be to employed memory partitioning unified management, and memory partitioning is relatively independent, generally can be by system's public memory field abnormal operation (such as memory overwriting etc.) impact.Because Ramdisk itself has the garbage reclamation function, so frequent read/write memory subregion can not produce memory fragmentation, but the memory partitioning size is fixed unalterable shortcoming after existing initialization, can't adapt to complicated system environments.
Ramfs does not need pre-first to file internal memory in initialization, all will apply for dynamically that on the public internal memory of system certain piece internal memory is finished using and can directly be discharged during every less important use internal memory.Ramfs can specify its maximum memory size that can use when creating, internal memory uses flexibly, and the memory size that takies increases and decreases along with the increase and decrease of data volume.But have the shortcoming that easily produces memory fragmentation, memory usage is not high.
Summary of the invention
Embodiment of the invention technical matters to be solved is, a kind of EMS memory management process is provided.Can solve the fixing and easy shortcoming that produces memory fragmentation of memory partitioning size in the prior art.
In order to solve the problems of the technologies described above, the embodiment of the invention provides the management method of memory partitioning in a kind of memory file system, comprising:
Receive to the first memory partitioning write the size be the write request of X byte file data, the size of wherein said the first memory partitioning is the P byte;
As the big or small Y of the free space of judging described the first memory partitioning during less than the big or small X of described file data, be the second memory partitioning of Q byte to system's application size then, wherein, Q 〉=P-Y+X;
The file data that has write on described the first memory partitioning is all copied on described the second memory partitioning, and discharge the space of described the first memory partitioning;
When the size that inquires described the second memory partitioning is not less than the free memory block of X byte, write described X byte file data to this free memory block.
Wherein, the size that the big or small Q that controls described the second memory partitioning increases with respect to the big or small P of the first memory partitioning be the first predetermined value positive integer doubly.
Wherein, the described file data that has write on described the first memory partitioning is all copied on described the second memory partitioning comprises:
The file data that copies on described the second memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the second memory partitioning.
Wherein, also comprise:
When receiving the delete instruction of deleting the file data of the big or small A of being on described the first memory partitioning, discharge the memory headroom that described file data takies;
Free space on judging described the first memory partitioning is the 3rd memory partitioning of L to system's application size during greater than the second predetermined value, wherein, and L＜Q-A;
The file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning, and discharge the space of described the first memory partitioning.
Wherein, the size that the big or small L that controls described the 3rd memory partitioning reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
Wherein, the described file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning comprises:
The file data that copies on described the 3rd memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the 3rd memory partitioning.
Correspondingly, the embodiment of the invention also provides a kind of memory management device, comprising:
The request receiving module is used for receiving and writes size to the first memory partitioning and be the write request of X byte file data, and the size of wherein said the first memory partitioning is the P byte;
New subregion application module is used for as the big or small Y of the free space of described the first memory partitioning of judgement during less than the big or small X of described file data, is the second memory partitioning of Q byte to system's application size then, wherein, and Q 〉=P-Y+X;
Old subregion release module is used for all copying the file data that has write on described the first memory partitioning to described the second memory partitioning, and discharges the space of described the first memory partitioning;
Writing module when being not less than the free memory block of X byte for the size that inquires described the second memory partitioning, writes described X byte file data to this free memory block.
Wherein, also comprise:
Removing module when being used for the file data of the big or small A of being on receiving described the first memory partitioning of deletion, discharges the memory headroom that described file data takies; Free space on judging described the first memory partitioning is the 3rd memory partitioning of L to system's application size during greater than the second predetermined value, wherein, and L＜Q-A; The file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning, and discharge the space of described the first memory partitioning.
Wherein, also comprise:
Control module, the size that the big or small Q that is used for controlling described the second memory partitioning increases with respect to the big or small P of the first memory partitioning be the first predetermined value positive integer doubly; With
The size that the big or small L that is used for controlling described the 3rd memory partitioning reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
Wherein, described old subregion release module also comprises:
Merge cells, the file data that is used for will copying on described the second memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the second memory partitioning.
Implement the embodiment of the invention, have following beneficial effect:
Can carry out dynamic management to memory partitioning according to the needs of system, and can not produce memory fragmentation, improve the utilization factor of memory headroom.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the schematic flow sheet of the management method of memory partitioning in a kind of memory file system of the embodiment of the invention;
Fig. 2 is another schematic flow sheet of the management method of memory partitioning in a kind of memory file system of the embodiment of the invention;
Fig. 3 is the synoptic diagram of the writing in files of the embodiment of the invention;
Fig. 4 is the synoptic diagram of the deleted file of the embodiment of the invention;
Fig. 5 is the structural representation of a kind of memory management device of the embodiment of the invention;
Fig. 6 is another structural representation of a kind of memory management device of the embodiment of the invention;
Fig. 7 is the structural representation of old subregion release module among Fig. 6.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Referring to Fig. 1, be the schematic flow sheet of the management method of memory partitioning in a kind of memory file system of the embodiment of the invention, this flow process comprises:
Step 101, receive to the first memory partitioning write the size be the write request of X byte file data, wherein the size of the first memory partitioning is the P byte.
Concrete, the first memory partitioning applied for when the initialization of Ramdisk ram disk, and size is the P byte, supposes to have write on this first memory partitioning other file, receive when writing size for the request of the file data of X byte to the first memory partitioning execution in step 102; If this first memory partitioning does not write other file, judge that whether the big or small P of this first memory partitioning is greater than X, if yes, then directly X byte file data are write described the first memory partitioning, if NO, then to memory headroom of system's application, to satisfy the request that writes X byte file data.
Step 102, as the big or small Y of the free space of judging the first memory partitioning during less than the big or small X of file data, be the second memory partitioning of Q byte to system's application size then, wherein, Q 〉=P-Y+X.
Concrete, as the big or small Y of the free space of judging the first memory partitioning during less than the big or small X of file data, show that the first memory partitioning does not have enough free spaces to write current file data, then this moment is to second larger memory partitioning of system's application, the size of the second memory partitioning is at least P-Y+X, when the second memory partitioning application success, then execution in step 103; If apply for unsuccessfully, return the message that can't write.
Step 103, the file data that has write on the first memory partitioning is all copied on the second memory partitioning, and discharge the space of the first memory partitioning.
Step 104, when the free memory block size that inquires the second memory partitioning is not less than the big or small X of file data, write described file data to this memory block.
Implement embodiments of the invention, after can overcoming the Ramdisk initialization and distributing, the fixing unalterable shortcoming of size, the requirement of responding system changes the size of memory partitioning, has improved the dirigibility that memory partitioning uses.
Referring to Fig. 2-Fig. 4, another schematic flow sheet for the management method of memory partitioning in a kind of memory file system of the embodiment of the invention comprises:
What step 201, judgement system sent is writing in files or the request of deleted file.
What the judgement system sent is to the first memory partitioning writing in files or the request of deleting the file of the first memory partitioning, if the request of writing in files, execution in step 202, if the request of deleted file, execution in step 207.
Concrete, referring to Fig. 3, the file that the first memory partitioning has write is file 1, file 2, file 3 and file 4, receives to the write request of the first memory partitioning writing in files 5.
Concrete, when the size of the free space of judging the first memory partitioning during less than the current file data that will write big or small, show that the first memory partitioning does not have enough free spaces to write current file data, then this moment is to second larger memory partitioning of system's application, the size of the second memory partitioning is at least P-Y+X, and when the second memory partitioning application success, then execution in step 204, if apply for unsuccessfully, return the message that can't write.
The size that the big or small Q of step 204, described the second memory partitioning of control increases with respect to the big or small P of the first memory partitioning be the first predetermined value positive integer doubly.
Concrete, the size that memory partitioning increases can be Granular Computing according to the 1M byte, the present invention that chooses and assess of the first predetermined value is not restricted.Then may waste more memory headroom if the granularity that increases is excessive, then may need repeatedly to increase subregion and just can satisfy the demands if the granularity that increases is less.For example, if the size of the free space of the first memory partitioning is the 0.5M byte, need to write the file data of 0.7M byte this moment, then the second memory partitioning of application only need to increase the 1M byte on the basis of the first memory partitioning size, if need to write the file data of 1.6M byte, then the second memory partitioning need to increase on the basis of the first memory partitioning the 2M byte, the size in the space of increase be regulation the first predetermined value positive integer doubly.
Concrete, referring to Fig. 3, with a file that writes 1 on the first memory partitioning, file 2, the data content of file 3 and file 4 all is copied to the second memory partitioning of new application, and file 1 to file 4 is merged into a continuous space, be understandable that, file 1, file 2, the concrete order of file 3 and file 4 at copy without limits, can arrange in any order, merge into a continuous space as long as satisfy, and the first address of this continuous space is identical with the first address of the second memory partitioning, namely this continuous space will be at the top of the second memory partitioning, during implementation, also can be at the least significant end of the second memory partitioning, like this, reservation that can maximum constraints go out the second memory partitioning the maximum memory piece, improve the utilization factor of memory headroom.
Step 206, when the size that inquires the second memory partitioning is not less than the free memory block of X byte, write described file data to this free memory block.
Concrete, travel through the free memory block on the second memory partitioning and calculate its size, when traversing a free memory block that enough writes the current file data, just file data is write this place, such as the free memory block of the back of the file 4 of Fig. 3.
Concrete, referring to Fig. 4, on receiving deletion the first memory partitioning during the removal request of file 2, the memory headroom that releasing document 2 is shared.
The size that the big or small L of step 209, described the 3rd memory partitioning of control reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
Concrete, suppose that the 3rd predetermined value is the 0.5M byte, it can be Granular Computing according to the 0.5M byte that memory partitioning reduces, the second predetermined value is the free space of 1M, to prevent at once again writing in files.The granularity that the Size-dependent of the 3rd predetermined value increases in memory partitioning, if the granularity that reduces too conference causes memory partitioning to reduce to operate untimely, if the granularity that reduces is too little then reduce operation may be too frequent, a kind of like this situation can appear, memory partitioning has just increased complete, deletes to reduce again memory partitioning behind the small documents at once again.
The free space size of supposing the first memory partitioning is the 1M byte, if delete the file 1 of 0.1M byte, behind deleted file, the free space size of the first memory partitioning becomes 1.1M, then do not need to reduce internal memory this moment, at least reserve the free space of 1M byte, if delete the file 2 of 0.7M byte, the free space of the first memory partitioning is 1.7M behind deleted file 2, the size of the 3rd memory partitioning of application this moment will reduce 0.5M on the big or small basis of the first memory partitioning, if delete the file 3 of 1M byte, the free space of the first memory partitioning is 2M behind deleted file 3, the size of the 3rd memory partitioning of this moment application will reduce 1.5M in the size of the first memory partitioning, and the positive integer that the size of the internal memory that reduces is the 3rd predetermined value 0.5M doubly.
This process and step 205 are similar, Ao Shu no longer herein, and the continuous space after the merging is as shown in Figure 4.
Implement embodiments of the invention, dynamically increase and decrease memory partitioning size can be realized, so that the memory partitioning of the memory file system after the expansion is separate, memory fragmentation can be do not produced, improve the utilization factor of memory headroom, can dynamically increase and decrease as required partition size again simultaneously.
Referring to Fig. 5, the structural representation for a kind of memory management device of the embodiment of the invention comprises:
Request receiving module 11 is used for receiving and writes size to the first memory partitioning and be the write request of X byte file data, and the size of wherein said the first memory partitioning is the P byte.
New subregion application module 12 is used for as the big or small Y of the free space of described the first memory partitioning of judgement during less than the big or small X of described file data, is the second memory partitioning of Q byte to system's application size then, wherein, and Q 〉=P-Y+X.
Old subregion release module 13 is used for all copying the file data that has write on described the first memory partitioning to described the second memory partitioning, and discharges the space of described the first memory partitioning.
Implement embodiments of the invention, can carry out dynamic management to memory partitioning, and can not produce memory fragmentation, improved the utilization factor of memory headroom.
Referring to Fig. 6 and Fig. 7, be another structural representation of a kind of memory management device of the embodiment of the invention, comprise equally request receiving module 11, new subregion application module 12, old subregion release module 13 and writing module 14, in addition, also comprise:
Removing module 15 when being used for the file data of the big or small A of being on receiving described the first memory partitioning of deletion, discharges the memory headroom that described file data takies; Free space on judging described the first memory partitioning is the 3rd memory partitioning of L to system's application size during greater than the second predetermined value, wherein, and L＜Q-A; The file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning, and discharge the space of described the first memory partitioning.
The size that the big or small L that is used for controlling described the 3rd memory partitioning reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
Wherein, old subregion release module 13 also comprises:
Merge cells 131, the file data that is used for will copying on described the second memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the second memory partitioning.
Implement embodiments of the invention, dynamically increase and decrease memory partitioning size can be realized, so that the memory partitioning of the memory file system after the expansion is separate, memory fragmentation can be do not produced, improve the utilization factor of memory headroom, can dynamically increase and decrease as required partition size again simultaneously.
One of ordinary skill in the art will appreciate that all or part of flow process that realizes in above-described embodiment method, to come the relevant hardware of instruction to finish by computer program, described program can be stored in the computer read/write memory medium, this program can comprise the flow process such as the embodiment of above-mentioned each side method when carrying out.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-Only Memory, ROM) or store-memory body (Random Access Memory, RAM) etc. at random.
Above disclosed only is a kind of preferred embodiment of the present invention, certainly can not limit with this interest field of the present invention, one of ordinary skill in the art will appreciate that all or part of flow process that realizes above-described embodiment, and according to the equivalent variations that claim of the present invention is done, still belong to the scope that invention is contained.
Claims (10)
1. the management method of memory partitioning in the memory file system is characterized in that, comprising:
Receive to the first memory partitioning write the size be the write request of X byte file data, the size of wherein said the first memory partitioning is the P byte;
As the big or small Y of the free space of judging described the first memory partitioning during less than the big or small X of described file data, be the second memory partitioning of Q byte to system's application size then, wherein, Q 〉=P-Y+X;
The file data that has write on described the first memory partitioning is all copied on described the second memory partitioning, and discharge the space of described the first memory partitioning;
When the size that inquires described the second memory partitioning is not less than the free memory block of X byte, write described X byte file data to this free memory block.
2. the method for claim 1 is characterized in that, also comprises:
The size that the big or small Q that controls described the second memory partitioning increases with respect to the big or small P of the first memory partitioning be the first predetermined value positive integer doubly.
3. method as claimed in claim 2 is characterized in that, the described file data that has write on described the first memory partitioning is all copied on described the second memory partitioning comprises:
The file data that copies on described the second memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the second memory partitioning.
4. method as claimed in claim 3 is characterized in that, also comprises:
When receiving the delete instruction of deleting the file data of the big or small A of being on described the first memory partitioning, discharge the memory headroom that described file data takies;
Free space on judging described the first memory partitioning is the 3rd memory partitioning of L to system's application size during greater than the second predetermined value, wherein, and L＜Q-A;
The file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning, and discharge the space of described the first memory partitioning.
5. method as claimed in claim 4 is characterized in that, also comprises:
The size that the big or small L that controls described the 3rd memory partitioning reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
6. method as claimed in claim 5 is characterized in that, the described file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning comprises:
The file data that copies on described the 3rd memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the 3rd memory partitioning.
7. a memory management device is characterized in that, comprising:
The request receiving module is used for receiving and writes size to the first memory partitioning and be the write request of X byte file data, and the size of wherein said the first memory partitioning is the P byte;
New subregion application module is used for as the big or small Y of the free space of described the first memory partitioning of judgement during less than the big or small X of described file data, is the second memory partitioning of Q byte to system's application size then, wherein, and Q 〉=P-Y+X;
Old subregion release module is used for all copying the file data that has write on described the first memory partitioning to described the second memory partitioning, and discharges the space of described the first memory partitioning;
Writing module when being not less than the free memory block of X byte for the size that inquires described the second memory partitioning, writes described X byte file data to this free memory block.
8. device as claimed in claim 7 is characterized in that, also comprises:
Removing module when being used for the file data of the big or small A of being on receiving described the first memory partitioning of deletion, discharges the memory headroom that described file data takies; Free space on judging described the first memory partitioning is the 3rd memory partitioning of L to system's application size during greater than the second predetermined value, wherein, and L＜Q-A; The file data that has write on described the first memory partitioning is all copied on described the 3rd memory partitioning, and discharge the space of described the first memory partitioning.
9. device as claimed in claim 8 is characterized in that, also comprises:
Control module, the size that the big or small Q that is used for controlling described the second memory partitioning increases with respect to the big or small P of the first memory partitioning be the first predetermined value positive integer doubly; With
The size that the big or small L that is used for controlling described the 3rd memory partitioning reduces with respect to the big or small P of the first memory partitioning be the 3rd predetermined value positive integer doubly.
10. device as claimed in claim 9 is characterized in that, described old subregion release module also comprises:
Merge cells, the file data that is used for will copying on described the second memory partitioning is merged into a continuous space, and the first address of described continuous space is identical with the first address of described the second memory partitioning.
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| CN109445724B (en) * | 2018-10-12 | 2022-03-01 | 森大（深圳）技术有限公司 | Printing memory management method, device and equipment |
| CN109445724A (en) * | 2018-10-12 | 2019-03-08 | 森大（深圳）技术有限公司 | Print memory management method, device and equipment |
| CN110109785A (en) * | 2019-04-16 | 2019-08-09 | 晶晨半导体(上海)股份有限公司 | Memory size acquisition methods, device, computer equipment and readable storage medium storing program for executing |
| CN110109785B (en) * | 2019-04-16 | 2023-03-31 | 晶晨半导体(上海)股份有限公司 | Memory capacity obtaining method and device, computer equipment and readable storage medium |
| CN113377989A (en) * | 2021-06-04 | 2021-09-10 | 上海云从汇临人工智能科技有限公司 | Data retrieval method, system, medium and device based on GPU |
| CN113468128A (en) * | 2021-07-21 | 2021-10-01 | 上海浦东发展银行股份有限公司 | Data processing method and device, electronic equipment and storage medium |
| CN113468128B (en) * | 2021-07-21 | 2023-02-17 | 上海浦东发展银行股份有限公司 | Data processing method and device, electronic equipment and storage medium |
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